The elevation angle of the boom during crane operation is generally not more than 78°. The elevation angle of the arm sweat is too large, which may easily cause the crane to tilt backward or pull the components. For the luffing of the boom, it is absolutely forbidden to change the operating lever before the hoisting load stops securely.
After the crane works, the boom should be lowered to between 40° and 60°, and turned to the downwind direction to reduce the windward area of the boom and prevent it from being damaged by strong winds.
The boom blew backwards, causing a rollover and a collapsed boom accident.
The crane can only lift the load vertically, it is strictly forbidden to drag the load that has not yet lifted off the ground, and side loading should be avoided.
When the crane is lifting at full load, it is forbidden to use two or more operations at the same time. The left and right rotation angles of the lifting boom are not
It can exceed 45°, and it is strictly forbidden to slant, pull and quickly lift. It is strictly forbidden to lift and pull objects buried in the ground, and it is strictly forbidden to forcibly lift and pull objects with a large area that stick to the ground.
When the crane works near the live line, it should keep a safe distance from it. Within the maximum rotation range, the closest distance allowed to the transmission line is shown in the table below. In rainy and foggy weather, the safe distance should be increased to more than 1.5 times. When the crane passes under the transmission line, the boom must be lowered.
The crane is strictly prohibited to be overloaded. If two cranes are used to lift a heavy object at the same time, they must obey the unified command of the special person.
The weight of the objects should not exceed 75% of the total allowable weight of the two machines. When lashing slings, pay attention to the load distribution